Fixing mono/stereo crash

components/audio_modem/audio_recorder_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/audio_modem/audio_recorder_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 157 matching lines @@
 
   int remaining_buffer_frames = buffer_->frames() - buffer_frame_index_;
   int frames_to_copy = std::min(remaining_buffer_frames, source->frames());
   source->CopyPartialFramesTo(0, frames_to_copy, buffer_frame_index_,
                               buffer_.get());
   buffer_frame_index_ += frames_to_copy;
 
   // Buffer full, send it for processing.
   if (buffer_->frames() == buffer_frame_index_) {
     ProcessSamples(buffer_.Pass(), decode_callback_);
-    buffer_ = media::AudioBus::Create(kDefaultChannels, total_buffer_frames_);
+    buffer_ = media::AudioBus::Create(source->channels(), total_buffer_frames_);
     buffer_frame_index_ = 0;
 
     // Copy any remaining frames in the source to our buffer.
     int remaining_source_frames = source->frames() - frames_to_copy;
     source->CopyPartialFramesTo(frames_to_copy, remaining_source_frames,
                                 buffer_frame_index_, buffer_.get());
     buffer_frame_index_ += remaining_source_frames;
   }
 }
 
@@ skipping 15 matching lines @@
   media::AudioManager::Get()->GetTaskRunner()->PostTaskAndReply(
       FROM_HERE,
       base::Bind(
           base::IgnoreResult(&AudioRecorderImpl::FlushAudioLoopForTesting),
           base::Unretained(this)),
       rl.QuitClosure());
   rl.Run();
 }
 
 }  // namespace audio_modem